High-fidelity sound, a unique anti-interference noise squelch function. Using quartz crystal oscillator, the frequency is more stable, the use of audio compression ---- expansion technology, greatly reduced noise, increased dynamic range with a separate output and mixed output can be connecting mixer and amplifier suitable for occasions Kara OK conferences, recordings, public communication, speech and other outdoor conference microphone to thank: the microphone is turned on, the sound of hair halo lit microphone features a low battery warning indicator.